The day-to-day lives of majestic animals, including lions, zebras, baboons and cheetahs, over the course of a year in Tanzania are documented in "Serengeti." As the season of plenty starts to come to an end, food is harder to find and the animals are put to the ultimate test. There are new arrivals and unexpected problems, as well as danger at almost every turn. These animals do anything they can to survive and protect their offspring, and they stop at nothing to prove their worthiness to their tribe. Each animal has a unique story, and many of the stories come to the surface.